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Further developments of a multi-phase transport model for relativistic nuclear collisions

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Nuclear Science and Techniques 2021年第10期32卷 110-142页

作者： zi-wei Lin Liang Zheng Department of Physics East Carolina UniversityGreenvilleNC 27858USA School of Mathematics and Physics China University of Geosciences(Wuhan)Wuhan 430074China

A multi-phase transport(AMPT)model was constructed as a self-contained kinetic theory-based description of relativistic nuclear collisions as it contains four main components:the fluctuating initial condition,a parton cascade,hadronization,and a hadron ***,we review the main developments after the first public release of the AMPT source code in 2004 and the corre-sponding publication that described the physics details of the model at that *** also discuss possible directions for future developments of the AMPT model to better study the properties of the dense matter created in relativistic collisions of small or large systems.

关键词： QGP Transport model Heavy-ion collisions

采用耗能装配节点的榫卯木构架抗震性能有限元分析

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地震工程学报 2025年第1期47卷 10-21页

作者：吴忠铁张轲解宁赵城吴为西北民族大学土木工程学院甘肃兰州730030

针对榫卯木构架常规梁柱榫卯节点的缺陷,提出一种榫卯木构架的梁柱耗能装配节点。为研究该耗能装配节点对木构架抗震性能的影响,利用有限元软件ABAQUS建立带有全钢耗能装配节点、橡胶柔性耗能装配节点、无加固的榫卯式节点三种不同类型... 详细信息

针对榫卯木构架常规梁柱榫卯节点的缺陷,提出一种榫卯木构架的梁柱耗能装配节点。为研究该耗能装配节点对木构架抗震性能的影响,利用有限元软件ABAQUS建立带有全钢耗能装配节点、橡胶柔性耗能装配节点、无加固的榫卯式节点三种不同类型榫卯木构架的有限元模型,并进行单调荷载加载分析和低周反复加载分析,主要研究这三类榫卯木构架模型的破坏特征、滞回曲线、骨架曲线、承载力及耗能能力等力学性能;同时,利用能力谱曲线和需求谱曲线,采用性能点探讨三类木构架的抗震性能。结果表明,与原榫卯木构架相比,该耗能装配节点能够有效地调整和控制木构架的破坏模式,增强梁柱节点的非线性力学性能,显著提高榫卯木构架的整体抗震性能。

关键词：榫卯木构架耗能装配节点力学性能性能点抗震性能

Propagation characteristics of vibration waves induced in surrounding rock by tunneling blasting

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Journal of Mountain Science 2017年第12期14卷 2620-2630页

作者： chen shi-hai hu shuai-wei zhang zi-hua wu jian Huaqiao University Xiamen 361021China Fujian Research Centerfor Tunneling and Urban Underground Space Engineering Huaqiao UniversityXiamen 361020China

The effect of blasting vibration waves on surrounding rock and supporting structures is an important field in underground engineering. In this paper, the separation variable method is used to solve the displacement potential function for the propagation of the blasting vibration waves. In the axis coordinate system, the particle motion and stress change with axial distance, radial distance and time is obtained in surrounding rock. The peak particle velocity law in surrounding rock under different blast loads and surrounding rock parameters is *** addition, the particle vibration characteristics in the surrounding rock are studied using numerical simulations method. The results shows that the peak particle velocity in surrounding rock appears negative exponent attenuation with the increase of axial distance, but it appears positive and negative fluctuations in radial direction. This phenomenon is a new discovery and it has been rarely investigated before. Moreover, the peak particle velocity attenuates more quickly and intensely in the near blasting field,which means that the supporting structure in a shorter distance away from the heading face is vulnerable to the impact of blasting vibration. Theattenuation of blasting vibration velocity is closely related to charge length, blasting load amplitude,attenuation index and rock elastic modulus. The numerical simulation accomplishes the same results and then demonstrates the validity of theoretical results.

关键词： Tunneling blasting Blasting vibration wave Surrounding rock Wave equation Vibration velocity

Antistatic PVC-graphene Composite through Plasticizer-mediated Exfoliation of Graphite

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Chinese Journal of Polymer Science 2018年第12期36卷 1361-1367页

作者： zi-Bo wei Yang Zhao Chao Wang Shigenori Kuga Yong Huang Min wu Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

Multilayer graphene was prepared by mechanical exfoliation of natural graphite with dioctyl phthalate （DOP） as milling medium without solvent. The obtained mixture could be directly mixed with poly（vinyl chloride）（PVC） for melt-forming, with DOP acting as plasticizer and graphene acting as conductive filler for antistatic performance. The composite showed surface resistance of 2.5 ×10 6 Ω/ at 1 wt% carbon additive, significantly lower than approx. 7 wt% of raw graphite required for achieving the same level. This value is low enough for practical antistatic criterion of 3 × 10 8 Ω/ . The effect of filler addition on mechanical performance was minimal, or even beneficial for the milled carbon in contrast to the case of raw graphite.

关键词： Antistatic composite Poly(vinyl chloride) Graphene Mechanical exfoliation Electrical property

Metadynamic recrystallization and microstructure evolution of a continuously cast Ti-microalloyed steel slab with heavy reduction

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Journal of Iron and Steel Research International 2022年第1期29卷 103-114页

作者： zi-jian wei Cheng Ji Tian-ci Chen Miao-yong Zhu Chen-hui wu Key Laboratory for Ecological Metallurgy of Multimetallic Ores(Ministry of Education) Shenyang 110819LiaoningChina School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina Pangang Group Research Institute Co. Ltd.Panzhihua 617000SichuanChina

The effects of the deformation parameters in the heavy reduction(HR)process on recrystallization kinetics and microstructure evolution were *** on the experimental results,metadynamic recrystallization(MDRX)kinetic and austenite grain size models were established for a continuously cast slab during ***,the evolution of the quenched microstructure after MDRX was observed using electron backscatter *** relative frequency of very low-angle grain boundaries decreased from 58.8% to 52.1%,and the relative frequency of high-angle grain boundaries increased from 28.5% to 38.9%.Analyses revealed that the recovery was the main softening *** decrease in the total grain boundary length indicated that subgrain growth occurred with increasing inter-pass *** main texture evolved from a {001}texture to a{112}texture,and the texture strength remained unchanged.

关键词： Microalloyed steel Heavy reduction Metadynamic recrystallization Microstructure evolution Kinetic model

Electromagnetic wave absorbing properties of TMCs(TM=Ti,Zr,Hf,Nb and Ta)and high entropy(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C

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Journal of Materials Science & Technology 2021年第15期74卷 105-118页

作者： Yanchun Zhou Biao Zhao Heng Chen Huimin Xiang Fu-zi Dai Shijiang wu wei Xu Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing100076China Henan Key Laboratory of Aeronautical Materials and Application Technology School of Material Science and EngineeringZhengzhou University of AeronauticsZhengzhou450046China Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education School of Materials Science and EngineeringTianjin UniversityTianjin300072China zibo Firstar New Material Incoqjorated Co.Ltd. Zibo255000China Shanghai Chenhua Science and Technology Coloration Ltd. Shanghai201804China

Electromagnetic wave(EMW)absorbing materials play a vital role in modern communication and information processing technologies to inhibit information leakage and prevent possible damages to environment and human ***,most of EMW absorbing materials are either composites of two or more phases or in the form of nanosheets,nanowires or nanofibers in order to enhance the EMW absorption performance through dielectric loss,magnetic loss and dielectric/magnetic loss ***,the combination of complex shapes/multi phases and nanosizes may compound the difficulties of materials processing,composition and interfaces control as well as performance maintenance during ***,searching for single phase materials with good stability and superior EMW absorbing properties is *** achieve this goal,the EMW absorbing properties of transition metal carbides TMCs(TM=Ti,Zr,Hf,Nb and Ta)and high entropy(Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))C which belong to ultrahigh temperature ceramics,were investigated in this *** to the good electrical conductivity and splitting of d orbitals into lower energy t2glevel and higher energy eglevel in TMC6octahedral arrangement,TMCs(TM=Ti,Zr,Hf,Nb and Ta)exhibit good EMW absorbing ***,Hf C and Ta C exhibit superior EMW absorbing *** minimum reflection loss(RLmin)value of Hf C is-55.8 d B at 6.0 GHz with the thickness of 3.8 mm and the effective absorption bandwidth(E_(AB))is 6.0 GHz from 12.0 to 18.0 GHz at thickness of 1.9 mm;the RL_(minvalue)of Ta C reaches-41.1 d B at 16.2 GHz with a thickness of 2.0 mm and the EABis 6.1 GHz with a thickness of 2.2 ***,the electromagnetic parameters,i.e.,complex permittivity and permeability are tunable by forming single phase solid solution or high entropy(Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))*** R_(Lminvalue)of high entropy(Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))C is-38.5 d B at 9.5 GHz with the thickness of 1.9 mm,and the EA

关键词： Transition metal carbides High entropy ceramics Microwave absorption Electromagnetic parameters Electronic structure Crystal field theory

Estimation of Attractive Regions of Nonlinear MPC Controller-A Feasible Solution-based Method

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信息与控制 2007年第2期36卷 192-198页

作者： WANG zi-yang wu Gang CHEN wei Department of Automation University of Science and Technology of China Hefei 230027 China

A new model predictive control(MPC) algorithm for nonlinear systems is presented,its stabilizing property is proved,and its attractive regions are *** presented method is based on the feasible solution,which makes the... 详细信息

关键词：非线性控制 NMPC 吸引区域可行性 MPC控制

Studies on the Recycling Efficiency of Thermoregulated Phase-separable Rh/PETPP Complex Catalyst

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Chinese Chemical Letters 2003年第1期14卷 91-93页

作者： Yan Hua WANG Fang CHENG Xiao wei wu zi Lin JIN State Key Laboratory of Fine Chemicals Dalian University of TechnologyDalian 116012

Effects on the recycling efficiency of thermoregulated phase-separable Rh/PETPP (P-[p-C6H4O(CH2CH2O)nH]3, N=3n) complex catalyst involved in hydroformylation of 1-decene are for the first time presented. It was found that the loss of Rh is dependent greatly on the composition of phosphine ligand PETPP and the organic solvent employed in the reaction.

关键词： Thermoregulated phase-separable catalysis (TPSC) hydroformylation nonionic phosphine ligand rhodium.

Dynamical switchable quantum nonreciprocity induced by off-resonant chiral two-photon driving

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Science China(Physics,Mechanics & Astronomy) 2024年第6期67卷 31-37页

作者： Da-wei Liu zi-Hao Li Shi-Lei Chao Ying wu Liu-Gang Si School of Physics and Institute for Quantum Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China

Optical nonreciprocity,which refers to the direction-dependent emission,scattering and absorption of photons,plays a very important role in quantum engineering and quantum information ***,we propose an all-optical approach to achieve the optical dynamical switchable quantum nonreciprocity by an off-resonant chiral two-photon driving in a single microring cavity,which differs from the conventional nonreciprocal *** is shown that the optical field with time-dependent statistical properties can be generated and the nonreciprocity flips periodically,with switchable photon blockade and photon-induced tunneling *** find that the dynamical system is robust and immune to the parameter variations,which loosens the parameter range of ***,the time window for one-way quantum information is sufficiently wide and *** work opens a new idea for the current quantum nonreciprocal research,which can facilitate a memory functionality and be used for future inmemory superconducting quantum *** other nonreciprocal quantum devices,i.e.,dynamical switchable nonreciprocal squeezing and entanglement,may be inspired by our method,which is expected to have important applications in future quantum technology.

关键词： dynamical switchable nonreciprocity single-photon source chiral two-photon driving